net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  *      FIXME: Make the setsockopt code POSIX compliant: That is
  18  *
  19  *      o       Return -EINVAL for setsockopt of short lengths
  20  *      o       Truncate getsockopt returns
  21  *      o       Return an optlen of the truncated length if need be
  22  *
  23  *      Changes:
  24  *      David L Stevens <dlstevens@us.ibm.com>:
  25  *              - added multicast source filtering API for MLDv2
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/capability.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/socket.h>
  33 #include <linux/sockios.h>
  34 #include <linux/sched.h>
  35 #include <linux/net.h>
  36 #include <linux/in6.h>
  37 #include <linux/netdevice.h>
  38 #include <linux/if_arp.h>
  39 #include <linux/init.h>
  40 #include <linux/sysctl.h>
  41 #include <linux/netfilter.h>
  42
  43 #include <net/sock.h>
  44 #include <net/snmp.h>
  45 #include <net/ipv6.h>
  46 #include <net/ndisc.h>
  47 #include <net/protocol.h>
  48 #include <net/transp_v6.h>
  49 #include <net/ip6_route.h>
  50 #include <net/addrconf.h>
  51 #include <net/inet_common.h>
  52 #include <net/tcp.h>
  53 #include <net/udp.h>
  54 #include <net/udplite.h>
  55 #include <net/xfrm.h>
  56
  57 #include <asm/uaccess.h>
  58
  59 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  60
  61 static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
  62                                                     int proto)
  63 {
  64         struct inet6_protocol *ops = NULL;
  65
  66         for (;;) {
  67                 struct ipv6_opt_hdr *opth;
  68                 int len;
  69
  70                 if (proto != NEXTHDR_HOP) {
  71                         ops = rcu_dereference(inet6_protos[proto]);
  72
  73                         if (unlikely(!ops))
  74                                 break;
  75
  76                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
  77                                 break;
  78                 }
  79
  80                 if (unlikely(!pskb_may_pull(skb, 8)))
  81                         break;
  82
  83                 opth = (void *)skb->data;
  84                 len = opth->hdrlen * 8 + 8;
  85
  86                 if (unlikely(!pskb_may_pull(skb, len)))
  87                         break;
  88
  89                 proto = opth->nexthdr;
  90                 __skb_pull(skb, len);
  91         }
  92
  93         return ops;
  94 }
  95
  96 static int ipv6_gso_send_check(struct sk_buff *skb)
  97 {
  98         struct ipv6hdr *ipv6h;
  99         struct inet6_protocol *ops;
 100         int err = -EINVAL;
 101
 102         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 103                 goto out;
 104
 105         ipv6h = skb->nh.ipv6h;
 106         __skb_pull(skb, sizeof(*ipv6h));
 107         err = -EPROTONOSUPPORT;
 108
 109         rcu_read_lock();
 110         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 111         if (likely(ops && ops->gso_send_check)) {
 112                 skb->h.raw = skb->data;
 113                 err = ops->gso_send_check(skb);
 114         }
 115         rcu_read_unlock();
 116
 117 out:
 118         return err;
 119 }
 120
 121 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
 122 {
 123         struct sk_buff *segs = ERR_PTR(-EINVAL);
 124         struct ipv6hdr *ipv6h;
 125         struct inet6_protocol *ops;
 126
 127         if (!(features & NETIF_F_HW_CSUM))
 128                 features &= ~NETIF_F_SG;
 129
 130         if (unlikely(skb_shinfo(skb)->gso_type &
 131                      ~(SKB_GSO_UDP |
 132                        SKB_GSO_DODGY |
 133                        SKB_GSO_TCP_ECN |
 134                        SKB_GSO_TCPV6 |
 135                        0)))
 136                 goto out;
 137
 138         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 139                 goto out;
 140
 141         ipv6h = skb->nh.ipv6h;
 142         __skb_pull(skb, sizeof(*ipv6h));
 143         segs = ERR_PTR(-EPROTONOSUPPORT);
 144
 145         rcu_read_lock();
 146         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 147         if (likely(ops && ops->gso_segment)) {
 148                 skb->h.raw = skb->data;
 149                 segs = ops->gso_segment(skb, features);
 150         }
 151         rcu_read_unlock();
 152
 153         if (unlikely(IS_ERR(segs)))
 154                 goto out;
 155
 156         for (skb = segs; skb; skb = skb->next) {
 157                 ipv6h = skb->nh.ipv6h;
 158                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
 159                                            sizeof(*ipv6h));
 160         }
 161
 162 out:
 163         return segs;
 164 }
 165
 166 static struct packet_type ipv6_packet_type = {
 167         .type = __constant_htons(ETH_P_IPV6),
 168         .func = ipv6_rcv,
 169         .gso_send_check = ipv6_gso_send_check,
 170         .gso_segment = ipv6_gso_segment,
 171 };
 172
 173 struct ip6_ra_chain *ip6_ra_chain;
 174 DEFINE_RWLOCK(ip6_ra_lock);
 175
 176 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
 177 {
 178         struct ip6_ra_chain *ra, *new_ra, **rap;
 179
 180         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
 181         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
 182                 return -EINVAL;
 183
 184         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
 185
 186         write_lock_bh(&ip6_ra_lock);
 187         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
 188                 if (ra->sk == sk) {
 189                         if (sel>=0) {
 190                                 write_unlock_bh(&ip6_ra_lock);
 191                                 kfree(new_ra);
 192                                 return -EADDRINUSE;
 193                         }
 194
 195                         *rap = ra->next;
 196                         write_unlock_bh(&ip6_ra_lock);
 197
 198                         if (ra->destructor)
 199                                 ra->destructor(sk);
 200                         sock_put(sk);
 201                         kfree(ra);
 202                         return 0;
 203                 }
 204         }
 205         if (new_ra == NULL) {
 206                 write_unlock_bh(&ip6_ra_lock);
 207                 return -ENOBUFS;
 208         }
 209         new_ra->sk = sk;
 210         new_ra->sel = sel;
 211         new_ra->destructor = destructor;
 212         new_ra->next = ra;
 213         *rap = new_ra;
 214         sock_hold(sk);
 215         write_unlock_bh(&ip6_ra_lock);
 216         return 0;
 217 }
 218
 219 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 220                     char __user *optval, int optlen)
 221 {
 222         struct ipv6_pinfo *np = inet6_sk(sk);
 223         int val, valbool;
 224         int retv = -ENOPROTOOPT;
 225
 226         if (optval == NULL)
 227                 val=0;
 228         else if (get_user(val, (int __user *) optval))
 229                 return -EFAULT;
 230
 231         valbool = (val!=0);
 232
 233         lock_sock(sk);
 234
 235         switch (optname) {
 236
 237         case IPV6_ADDRFORM:
 238                 if (val == PF_INET) {
 239                         struct ipv6_txoptions *opt;
 240                         struct sk_buff *pktopt;
 241
 242                         if (sk->sk_protocol != IPPROTO_UDP &&
 243                             sk->sk_protocol != IPPROTO_UDPLITE &&
 244                             sk->sk_protocol != IPPROTO_TCP)
 245                                 break;
 246
 247                         if (sk->sk_state != TCP_ESTABLISHED) {
 248                                 retv = -ENOTCONN;
 249                                 break;
 250                         }
 251
 252                         if (ipv6_only_sock(sk) ||
 253                             !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
 254                                 retv = -EADDRNOTAVAIL;
 255                                 break;
 256                         }
 257
 258                         fl6_free_socklist(sk);
 259                         ipv6_sock_mc_close(sk);
 260
 261                         /*
 262                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 263                          * remove it from the refcnt debug socks count in the
 264                          * original family...
 265                          */
 266                         sk_refcnt_debug_dec(sk);
 267
 268                         if (sk->sk_protocol == IPPROTO_TCP) {
 269                                 struct inet_connection_sock *icsk = inet_csk(sk);
 270
 271                                 local_bh_disable();
 272                                 sock_prot_dec_use(sk->sk_prot);
 273                                 sock_prot_inc_use(&tcp_prot);
 274                                 local_bh_enable();
 275                                 sk->sk_prot = &tcp_prot;
 276                                 icsk->icsk_af_ops = &ipv4_specific;
 277                                 sk->sk_socket->ops = &inet_stream_ops;
 278                                 sk->sk_family = PF_INET;
 279                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 280                         } else {
 281                                 struct proto *prot = &udp_prot;
 282
 283                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 284                                         prot = &udplite_prot;
 285                                 local_bh_disable();
 286                                 sock_prot_dec_use(sk->sk_prot);
 287                                 sock_prot_inc_use(prot);
 288                                 local_bh_enable();
 289                                 sk->sk_prot = prot;
 290                                 sk->sk_socket->ops = &inet_dgram_ops;
 291                                 sk->sk_family = PF_INET;
 292                         }
 293                         opt = xchg(&np->opt, NULL);
 294                         if (opt)
 295                                 sock_kfree_s(sk, opt, opt->tot_len);
 296                         pktopt = xchg(&np->pktoptions, NULL);
 297                         if (pktopt)
 298                                 kfree_skb(pktopt);
 299
 300                         sk->sk_destruct = inet_sock_destruct;
 301                         /*
 302                          * ... and add it to the refcnt debug socks count
 303                          * in the new family. -acme
 304                          */
 305                         sk_refcnt_debug_inc(sk);
 306                         module_put(THIS_MODULE);
 307                         retv = 0;
 308                         break;
 309                 }
 310                 goto e_inval;
 311
 312         case IPV6_V6ONLY:
 313                 if (inet_sk(sk)->num)
 314                         goto e_inval;
 315                 np->ipv6only = valbool;
 316                 retv = 0;
 317                 break;
 318
 319         case IPV6_RECVPKTINFO:
 320                 np->rxopt.bits.rxinfo = valbool;
 321                 retv = 0;
 322                 break;
 323
 324         case IPV6_2292PKTINFO:
 325                 np->rxopt.bits.rxoinfo = valbool;
 326                 retv = 0;
 327                 break;
 328
 329         case IPV6_RECVHOPLIMIT:
 330                 np->rxopt.bits.rxhlim = valbool;
 331                 retv = 0;
 332                 break;
 333
 334         case IPV6_2292HOPLIMIT:
 335                 np->rxopt.bits.rxohlim = valbool;
 336                 retv = 0;
 337                 break;
 338
 339         case IPV6_RECVRTHDR:
 340                 if (val < 0 || val > 2)
 341                         goto e_inval;
 342                 np->rxopt.bits.srcrt = val;
 343                 retv = 0;
 344                 break;
 345
 346         case IPV6_2292RTHDR:
 347                 if (val < 0 || val > 2)
 348                         goto e_inval;
 349                 np->rxopt.bits.osrcrt = val;
 350                 retv = 0;
 351                 break;
 352
 353         case IPV6_RECVHOPOPTS:
 354                 np->rxopt.bits.hopopts = valbool;
 355                 retv = 0;
 356                 break;
 357
 358         case IPV6_2292HOPOPTS:
 359                 np->rxopt.bits.ohopopts = valbool;
 360                 retv = 0;
 361                 break;
 362
 363         case IPV6_RECVDSTOPTS:
 364                 np->rxopt.bits.dstopts = valbool;
 365                 retv = 0;
 366                 break;
 367
 368         case IPV6_2292DSTOPTS:
 369                 np->rxopt.bits.odstopts = valbool;
 370                 retv = 0;
 371                 break;
 372
 373         case IPV6_TCLASS:
 374                 if (val < -1 || val > 0xff)
 375                         goto e_inval;
 376                 np->tclass = val;
 377                 retv = 0;
 378                 break;
 379
 380         case IPV6_RECVTCLASS:
 381                 np->rxopt.bits.rxtclass = valbool;
 382                 retv = 0;
 383                 break;
 384
 385         case IPV6_FLOWINFO:
 386                 np->rxopt.bits.rxflow = valbool;
 387                 retv = 0;
 388                 break;
 389
 390         case IPV6_HOPOPTS:
 391         case IPV6_RTHDRDSTOPTS:
 392         case IPV6_RTHDR:
 393         case IPV6_DSTOPTS:
 394         {
 395                 struct ipv6_txoptions *opt;
 396                 if (optlen == 0)
 397                         optval = NULL;
 398
 399                 /* hop-by-hop / destination options are privileged option */
 400                 retv = -EPERM;
 401                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 402                         break;
 403
 404                 retv = -EINVAL;
 405                 if (optlen & 0x7 || optlen > 8 * 255)
 406                         break;
 407
 408                 opt = ipv6_renew_options(sk, np->opt, optname,
 409                                          (struct ipv6_opt_hdr __user *)optval,
 410                                          optlen);
 411                 if (IS_ERR(opt)) {
 412                         retv = PTR_ERR(opt);
 413                         break;
 414                 }
 415
 416                 /* routing header option needs extra check */
 417                 if (optname == IPV6_RTHDR && opt->srcrt) {
 418                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 419                         switch (rthdr->type) {
 420                         case IPV6_SRCRT_TYPE_0:
 421 #ifdef CONFIG_IPV6_MIP6
 422                         case IPV6_SRCRT_TYPE_2:
 423 #endif
 424                                 break;
 425                         default:
 426                                 goto sticky_done;
 427                         }
 428
 429                         if ((rthdr->hdrlen & 1) ||
 430                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 431                                 goto sticky_done;
 432                 }
 433
 434                 retv = 0;
 435                 if (inet_sk(sk)->is_icsk) {
 436                         if (opt) {
 437                                 struct inet_connection_sock *icsk = inet_csk(sk);
 438                                 if (!((1 << sk->sk_state) &
 439                                       (TCPF_LISTEN | TCPF_CLOSE))
 440                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 441                                         icsk->icsk_ext_hdr_len =
 442                                                 opt->opt_flen + opt->opt_nflen;
 443                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 444                                 }
 445                         }
 446                         opt = xchg(&np->opt, opt);
 447                         sk_dst_reset(sk);
 448                 } else {
 449                         write_lock(&sk->sk_dst_lock);
 450                         opt = xchg(&np->opt, opt);
 451                         write_unlock(&sk->sk_dst_lock);
 452                         sk_dst_reset(sk);
 453                 }
 454 sticky_done:
 455                 if (opt)
 456                         sock_kfree_s(sk, opt, opt->tot_len);
 457                 break;
 458         }
 459
 460         case IPV6_2292PKTOPTIONS:
 461         {
 462                 struct ipv6_txoptions *opt = NULL;
 463                 struct msghdr msg;
 464                 struct flowi fl;
 465                 int junk;
 466
 467                 fl.fl6_flowlabel = 0;
 468                 fl.oif = sk->sk_bound_dev_if;
 469
 470                 if (optlen == 0)
 471                         goto update;
 472
 473                 /* 1K is probably excessive
 474                  * 1K is surely not enough, 2K per standard header is 16K.
 475                  */
 476                 retv = -EINVAL;
 477                 if (optlen > 64*1024)
 478                         break;
 479
 480                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 481                 retv = -ENOBUFS;
 482                 if (opt == NULL)
 483                         break;
 484
 485                 memset(opt, 0, sizeof(*opt));
 486                 opt->tot_len = sizeof(*opt) + optlen;
 487                 retv = -EFAULT;
 488                 if (copy_from_user(opt+1, optval, optlen))
 489                         goto done;
 490
 491                 msg.msg_controllen = optlen;
 492                 msg.msg_control = (void*)(opt+1);
 493
 494                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 495                 if (retv)
 496                         goto done;
 497 update:
 498                 retv = 0;
 499                 if (inet_sk(sk)->is_icsk) {
 500                         if (opt) {
 501                                 struct inet_connection_sock *icsk = inet_csk(sk);
 502                                 if (!((1 << sk->sk_state) &
 503                                       (TCPF_LISTEN | TCPF_CLOSE))
 504                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 505                                         icsk->icsk_ext_hdr_len =
 506                                                 opt->opt_flen + opt->opt_nflen;
 507                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 508                                 }
 509                         }
 510                         opt = xchg(&np->opt, opt);
 511                         sk_dst_reset(sk);
 512                 } else {
 513                         write_lock(&sk->sk_dst_lock);
 514                         opt = xchg(&np->opt, opt);
 515                         write_unlock(&sk->sk_dst_lock);
 516                         sk_dst_reset(sk);
 517                 }
 518
 519 done:
 520                 if (opt)
 521                         sock_kfree_s(sk, opt, opt->tot_len);
 522                 break;
 523         }
 524         case IPV6_UNICAST_HOPS:
 525                 if (val > 255 || val < -1)
 526                         goto e_inval;
 527                 np->hop_limit = val;
 528                 retv = 0;
 529                 break;
 530
 531         case IPV6_MULTICAST_HOPS:
 532                 if (sk->sk_type == SOCK_STREAM)
 533                         goto e_inval;
 534                 if (val > 255 || val < -1)
 535                         goto e_inval;
 536                 np->mcast_hops = val;
 537                 retv = 0;
 538                 break;
 539
 540         case IPV6_MULTICAST_LOOP:
 541                 np->mc_loop = valbool;
 542                 retv = 0;
 543                 break;
 544
 545         case IPV6_MULTICAST_IF:
 546                 if (sk->sk_type == SOCK_STREAM)
 547                         goto e_inval;
 548                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 549                         goto e_inval;
 550
 551                 if (__dev_get_by_index(val) == NULL) {
 552                         retv = -ENODEV;
 553                         break;
 554                 }
 555                 np->mcast_oif = val;
 556                 retv = 0;
 557                 break;
 558         case IPV6_ADD_MEMBERSHIP:
 559         case IPV6_DROP_MEMBERSHIP:
 560         {
 561                 struct ipv6_mreq mreq;
 562
 563                 retv = -EFAULT;
 564                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 565                         break;
 566
 567                 if (optname == IPV6_ADD_MEMBERSHIP)
 568                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 569                 else
 570                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 571                 break;
 572         }
 573         case IPV6_JOIN_ANYCAST:
 574         case IPV6_LEAVE_ANYCAST:
 575         {
 576                 struct ipv6_mreq mreq;
 577
 578                 if (optlen != sizeof(struct ipv6_mreq))
 579                         goto e_inval;
 580
 581                 retv = -EFAULT;
 582                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 583                         break;
 584
 585                 if (optname == IPV6_JOIN_ANYCAST)
 586                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 587                 else
 588                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 589                 break;
 590         }
 591         case MCAST_JOIN_GROUP:
 592         case MCAST_LEAVE_GROUP:
 593         {
 594                 struct group_req greq;
 595                 struct sockaddr_in6 *psin6;
 596
 597                 retv = -EFAULT;
 598                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 599                         break;
 600                 if (greq.gr_group.ss_family != AF_INET6) {
 601                         retv = -EADDRNOTAVAIL;
 602                         break;
 603                 }
 604                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 605                 if (optname == MCAST_JOIN_GROUP)
 606                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 607                                 &psin6->sin6_addr);
 608                 else
 609                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 610                                 &psin6->sin6_addr);
 611                 break;
 612         }
 613         case MCAST_JOIN_SOURCE_GROUP:
 614         case MCAST_LEAVE_SOURCE_GROUP:
 615         case MCAST_BLOCK_SOURCE:
 616         case MCAST_UNBLOCK_SOURCE:
 617         {
 618                 struct group_source_req greqs;
 619                 int omode, add;
 620
 621                 if (optlen != sizeof(struct group_source_req))
 622                         goto e_inval;
 623                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 624                         retv = -EFAULT;
 625                         break;
 626                 }
 627                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 628                     greqs.gsr_source.ss_family != AF_INET6) {
 629                         retv = -EADDRNOTAVAIL;
 630                         break;
 631                 }
 632                 if (optname == MCAST_BLOCK_SOURCE) {
 633                         omode = MCAST_EXCLUDE;
 634                         add = 1;
 635                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 636                         omode = MCAST_EXCLUDE;
 637                         add = 0;
 638                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 639                         struct sockaddr_in6 *psin6;
 640
 641                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 642                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 643                                 &psin6->sin6_addr);
 644                         /* prior join w/ different source is ok */
 645                         if (retv && retv != -EADDRINUSE)
 646                                 break;
 647                         omode = MCAST_INCLUDE;
 648                         add = 1;
 649                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 650                         omode = MCAST_INCLUDE;
 651                         add = 0;
 652                 }
 653                 retv = ip6_mc_source(add, omode, sk, &greqs);
 654                 break;
 655         }
 656         case MCAST_MSFILTER:
 657         {
 658                 extern int sysctl_mld_max_msf;
 659                 struct group_filter *gsf;
 660
 661                 if (optlen < GROUP_FILTER_SIZE(0))
 662                         goto e_inval;
 663                 if (optlen > sysctl_optmem_max) {
 664                         retv = -ENOBUFS;
 665                         break;
 666                 }
 667                 gsf = kmalloc(optlen,GFP_KERNEL);
 668                 if (gsf == 0) {
 669                         retv = -ENOBUFS;
 670                         break;
 671                 }
 672                 retv = -EFAULT;
 673                 if (copy_from_user(gsf, optval, optlen)) {
 674                         kfree(gsf);
 675                         break;
 676                 }
 677                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 678                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 679                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 680                         kfree(gsf);
 681                         retv = -ENOBUFS;
 682                         break;
 683                 }
 684                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 685                         kfree(gsf);
 686                         retv = -EINVAL;
 687                         break;
 688                 }
 689                 retv = ip6_mc_msfilter(sk, gsf);
 690                 kfree(gsf);
 691
 692                 break;
 693         }
 694         case IPV6_ROUTER_ALERT:
 695                 retv = ip6_ra_control(sk, val, NULL);
 696                 break;
 697         case IPV6_MTU_DISCOVER:
 698                 if (val<0 || val>2)
 699                         goto e_inval;
 700                 np->pmtudisc = val;
 701                 retv = 0;
 702                 break;
 703         case IPV6_MTU:
 704                 if (val && val < IPV6_MIN_MTU)
 705                         goto e_inval;
 706                 np->frag_size = val;
 707                 retv = 0;
 708                 break;
 709         case IPV6_RECVERR:
 710                 np->recverr = valbool;
 711                 if (!val)
 712                         skb_queue_purge(&sk->sk_error_queue);
 713                 retv = 0;
 714                 break;
 715         case IPV6_FLOWINFO_SEND:
 716                 np->sndflow = valbool;
 717                 retv = 0;
 718                 break;
 719         case IPV6_FLOWLABEL_MGR:
 720                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 721                 break;
 722         case IPV6_IPSEC_POLICY:
 723         case IPV6_XFRM_POLICY:
 724                 retv = -EPERM;
 725                 if (!capable(CAP_NET_ADMIN))
 726                         break;
 727                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 728                 break;
 729
 730         }
 731         release_sock(sk);
 732
 733         return retv;
 734
 735 e_inval:
 736         release_sock(sk);
 737         return -EINVAL;
 738 }
 739
 740 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 741                     char __user *optval, int optlen)
 742 {
 743         int err;
 744
 745         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 746                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 747
 748         if (level != SOL_IPV6)
 749                 return -ENOPROTOOPT;
 750
 751         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 752 #ifdef CONFIG_NETFILTER
 753         /* we need to exclude all possible ENOPROTOOPTs except default case */
 754         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 755                         optname != IPV6_XFRM_POLICY) {
 756                 lock_sock(sk);
 757                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 758                                 optlen);
 759                 release_sock(sk);
 760         }
 761 #endif
 762         return err;
 763 }
 764
 765
 766 #ifdef CONFIG_COMPAT
 767 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 768                            char __user *optval, int optlen)
 769 {
 770         int err;
 771
 772         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 773                 if (udp_prot.compat_setsockopt != NULL)
 774                         return udp_prot.compat_setsockopt(sk, level, optname,
 775                                                           optval, optlen);
 776                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 777         }
 778
 779         if (level != SOL_IPV6)
 780                 return -ENOPROTOOPT;
 781
 782         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 783 #ifdef CONFIG_NETFILTER
 784         /* we need to exclude all possible ENOPROTOOPTs except default case */
 785         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 786             optname != IPV6_XFRM_POLICY) {
 787                 lock_sock(sk);
 788                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 789                                            optval, optlen);
 790                 release_sock(sk);
 791         }
 792 #endif
 793         return err;
 794 }
 795
 796 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 797 #endif
 798
 799 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
 800                                   char __user *optval, int len)
 801 {
 802         if (!hdr)
 803                 return 0;
 804         len = min_t(int, len, ipv6_optlen(hdr));
 805         if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
 806                 return -EFAULT;
 807         return len;
 808 }
 809
 810 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 811                     char __user *optval, int __user *optlen)
 812 {
 813         struct ipv6_pinfo *np = inet6_sk(sk);
 814         int len;
 815         int val;
 816
 817         if (get_user(len, optlen))
 818                 return -EFAULT;
 819         switch (optname) {
 820         case IPV6_ADDRFORM:
 821                 if (sk->sk_protocol != IPPROTO_UDP &&
 822                     sk->sk_protocol != IPPROTO_UDPLITE &&
 823                     sk->sk_protocol != IPPROTO_TCP)
 824                         return -EINVAL;
 825                 if (sk->sk_state != TCP_ESTABLISHED)
 826                         return -ENOTCONN;
 827                 val = sk->sk_family;
 828                 break;
 829         case MCAST_MSFILTER:
 830         {
 831                 struct group_filter gsf;
 832                 int err;
 833
 834                 if (len < GROUP_FILTER_SIZE(0))
 835                         return -EINVAL;
 836                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 837                         return -EFAULT;
 838                 lock_sock(sk);
 839                 err = ip6_mc_msfget(sk, &gsf,
 840                         (struct group_filter __user *)optval, optlen);
 841                 release_sock(sk);
 842                 return err;
 843         }
 844
 845         case IPV6_2292PKTOPTIONS:
 846         {
 847                 struct msghdr msg;
 848                 struct sk_buff *skb;
 849
 850                 if (sk->sk_type != SOCK_STREAM)
 851                         return -ENOPROTOOPT;
 852
 853                 msg.msg_control = optval;
 854                 msg.msg_controllen = len;
 855                 msg.msg_flags = 0;
 856
 857                 lock_sock(sk);
 858                 skb = np->pktoptions;
 859                 if (skb)
 860                         atomic_inc(&skb->users);
 861                 release_sock(sk);
 862
 863                 if (skb) {
 864                         int err = datagram_recv_ctl(sk, &msg, skb);
 865                         kfree_skb(skb);
 866                         if (err)
 867                                 return err;
 868                 } else {
 869                         if (np->rxopt.bits.rxinfo) {
 870                                 struct in6_pktinfo src_info;
 871                                 src_info.ipi6_ifindex = np->mcast_oif;
 872                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 873                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 874                         }
 875                         if (np->rxopt.bits.rxhlim) {
 876                                 int hlim = np->mcast_hops;
 877                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 878                         }
 879                         if (np->rxopt.bits.rxoinfo) {
 880                                 struct in6_pktinfo src_info;
 881                                 src_info.ipi6_ifindex = np->mcast_oif;
 882                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 883                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 884                         }
 885                         if (np->rxopt.bits.rxohlim) {
 886                                 int hlim = np->mcast_hops;
 887                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 888                         }
 889                 }
 890                 len -= msg.msg_controllen;
 891                 return put_user(len, optlen);
 892         }
 893         case IPV6_MTU:
 894         {
 895                 struct dst_entry *dst;
 896                 val = 0;
 897                 lock_sock(sk);
 898                 dst = sk_dst_get(sk);
 899                 if (dst) {
 900                         val = dst_mtu(dst);
 901                         dst_release(dst);
 902                 }
 903                 release_sock(sk);
 904                 if (!val)
 905                         return -ENOTCONN;
 906                 break;
 907         }
 908
 909         case IPV6_V6ONLY:
 910                 val = np->ipv6only;
 911                 break;
 912
 913         case IPV6_RECVPKTINFO:
 914                 val = np->rxopt.bits.rxinfo;
 915                 break;
 916
 917         case IPV6_2292PKTINFO:
 918                 val = np->rxopt.bits.rxoinfo;
 919                 break;
 920
 921         case IPV6_RECVHOPLIMIT:
 922                 val = np->rxopt.bits.rxhlim;
 923                 break;
 924
 925         case IPV6_2292HOPLIMIT:
 926                 val = np->rxopt.bits.rxohlim;
 927                 break;
 928
 929         case IPV6_RECVRTHDR:
 930                 val = np->rxopt.bits.srcrt;
 931                 break;
 932
 933         case IPV6_2292RTHDR:
 934                 val = np->rxopt.bits.osrcrt;
 935                 break;
 936
 937         case IPV6_HOPOPTS:
 938         case IPV6_RTHDRDSTOPTS:
 939         case IPV6_RTHDR:
 940         case IPV6_DSTOPTS:
 941         {
 942
 943                 lock_sock(sk);
 944                 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
 945                                              optval, len);
 946                 release_sock(sk);
 947                 return put_user(len, optlen);
 948         }
 949
 950         case IPV6_RECVHOPOPTS:
 951                 val = np->rxopt.bits.hopopts;
 952                 break;
 953
 954         case IPV6_2292HOPOPTS:
 955                 val = np->rxopt.bits.ohopopts;
 956                 break;
 957
 958         case IPV6_RECVDSTOPTS:
 959                 val = np->rxopt.bits.dstopts;
 960                 break;
 961
 962         case IPV6_2292DSTOPTS:
 963                 val = np->rxopt.bits.odstopts;
 964                 break;
 965
 966         case IPV6_TCLASS:
 967                 val = np->tclass;
 968                 if (val < 0)
 969                         val = 0;
 970                 break;
 971
 972         case IPV6_RECVTCLASS:
 973                 val = np->rxopt.bits.rxtclass;
 974                 break;
 975
 976         case IPV6_FLOWINFO:
 977                 val = np->rxopt.bits.rxflow;
 978                 break;
 979
 980         case IPV6_UNICAST_HOPS:
 981         case IPV6_MULTICAST_HOPS:
 982         {
 983                 struct dst_entry *dst;
 984
 985                 if (optname == IPV6_UNICAST_HOPS)
 986                         val = np->hop_limit;
 987                 else
 988                         val = np->mcast_hops;
 989
 990                 dst = sk_dst_get(sk);
 991                 if (dst) {
 992                         if (val < 0)
 993                                 val = dst_metric(dst, RTAX_HOPLIMIT);
 994                         if (val < 0)
 995                                 val = ipv6_get_hoplimit(dst->dev);
 996                         dst_release(dst);
 997                 }
 998                 if (val < 0)
 999                         val = ipv6_devconf.hop_limit;
1000                 break;
1001         }
1002
1003         case IPV6_MULTICAST_LOOP:
1004                 val = np->mc_loop;
1005                 break;
1006
1007         case IPV6_MULTICAST_IF:
1008                 val = np->mcast_oif;
1009                 break;
1010
1011         case IPV6_MTU_DISCOVER:
1012                 val = np->pmtudisc;
1013                 break;
1014
1015         case IPV6_RECVERR:
1016                 val = np->recverr;
1017                 break;
1018
1019         case IPV6_FLOWINFO_SEND:
1020                 val = np->sndflow;
1021                 break;
1022
1023         default:
1024                 return -EINVAL;
1025         }
1026         len = min_t(unsigned int, sizeof(int), len);
1027         if(put_user(len, optlen))
1028                 return -EFAULT;
1029         if(copy_to_user(optval,&val,len))
1030                 return -EFAULT;
1031         return 0;
1032 }
1033
1034 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1035                     char __user *optval, int __user *optlen)
1036 {
1037         int err;
1038
1039         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1040                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1041
1042         if(level != SOL_IPV6)
1043                 return -ENOPROTOOPT;
1044
1045         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1046 #ifdef CONFIG_NETFILTER
1047         /* we need to exclude all possible EINVALs except default case */
1048         if (err == -EINVAL && optname != IPV6_ADDRFORM &&
1049                         optname != MCAST_MSFILTER) {
1050                 int len;
1051
1052                 if (get_user(len, optlen))
1053                         return -EFAULT;
1054
1055                 lock_sock(sk);
1056                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1057                                 &len);
1058                 release_sock(sk);
1059                 if (err >= 0)
1060                         err = put_user(len, optlen);
1061         }
1062 #endif
1063         return err;
1064 }
1065
1066 #ifdef CONFIG_COMPAT
1067 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1068                            char __user *optval, int __user *optlen)
1069 {
1070         int err;
1071
1072         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1073                 if (udp_prot.compat_getsockopt != NULL)
1074                         return udp_prot.compat_getsockopt(sk, level, optname,
1075                                                           optval, optlen);
1076                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1077         }
1078
1079         if (level != SOL_IPV6)
1080                 return -ENOPROTOOPT;
1081
1082         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1083 #ifdef CONFIG_NETFILTER
1084         /* we need to exclude all possible EINVALs except default case */
1085         if (err == -EINVAL && optname != IPV6_ADDRFORM &&
1086                         optname != MCAST_MSFILTER) {
1087                 int len;
1088
1089                 if (get_user(len, optlen))
1090                         return -EFAULT;
1091
1092                 lock_sock(sk);
1093                 err = compat_nf_getsockopt(sk, PF_INET6,
1094                                            optname, optval, &len);
1095                 release_sock(sk);
1096                 if (err >= 0)
1097                         err = put_user(len, optlen);
1098         }
1099 #endif
1100         return err;
1101 }
1102
1103 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1104 #endif
1105
1106 void __init ipv6_packet_init(void)
1107 {
1108         dev_add_pack(&ipv6_packet_type);
1109 }
1110
1111 void ipv6_packet_cleanup(void)
1112 {
1113         dev_remove_pack(&ipv6_packet_type);
1114 }